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2016 ; 7
(ä): 10698
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Fear of large carnivores causes a trophic cascade
#MMPMID26906881
Suraci JP
; Clinchy M
; Dill LM
; Roberts D
; Zanette LY
Nat Commun
2016[Feb]; 7
(ä): 10698
PMID26906881
show ga
The fear large carnivores inspire, independent of their direct killing of prey,
may itself cause cascading effects down food webs potentially critical for
conserving ecosystem function, particularly by affecting large herbivores and
mesocarnivores. However, the evidence of this has been repeatedly challenged
because it remains experimentally untested. Here we show that experimentally
manipulating fear itself in free-living mesocarnivore (raccoon) populations using
month-long playbacks of large carnivore vocalizations caused just such cascading
effects, reducing mesocarnivore foraging to the benefit of the mesocarnivore's
prey, which in turn affected a competitor and prey of the mesocarnivore's prey.
We further report that by experimentally restoring the fear of large carnivores
in our study system, where most large carnivores have been extirpated, we
succeeded in reversing this mesocarnivore's impacts. We suggest that our results
reinforce the need to conserve large carnivores given the significant "ecosystem
service" the fear of them provides.